Neonchameleon
Legend
You roll Action Die + Stat vs the target numbers (from the challenge dice). So you are very likely to fail without the action die.But then, under the momentum section, if you have negative momentum, you must cancel your action die if it matches what's on your die. The rules then say "You still check the success of your move by comparing your stat plus your adds to the challenge dice, but you won’t have your action die to help you." And that's where my brain stops working, because (a) how does your action die help you--it seems like it just provides a target number for you--and (b) without the action die, how do you determine if you've succeeded on a roll or not?
If your momentum is negative you're in trouble and stuck in the metaphorical mud. You treat the roll of your (negative) momentum on the die as a 0 instead. So if your momentum is -4, you treat rolls of -4 as if you'd rolled a 0 instead. (And 1,2,3,5,6 as normal). A -6 momentum (that cancels 6s which would probably have otherwise succeeded) is worse than a -1 (which cancels 1s that would probably have otherwise failed anyway).